/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.client;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.UUID;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellBuilder;
import org.apache.hadoop.hbase.CellBuilderType;
import org.apache.hadoop.hbase.ExtendedCell;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.security.visibility.CellVisibility;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Used to perform Delete operations on a single row.
 * <p>
 * To delete an entire row, instantiate a Delete object with the row to delete. To further define
 * the scope of what to delete, perform additional methods as outlined below.
 * <p>
 * To delete specific families, execute {@link #addFamily(byte[]) deleteFamily} for each family to
 * delete.
 * <p>
 * To delete multiple versions of specific columns, execute {@link #addColumns(byte[], byte[])
 * deleteColumns} for each column to delete.
 * <p>
 * To delete specific versions of specific columns, execute {@link #addColumn(byte[], byte[], long)
 * deleteColumn} for each column version to delete.
 * <p>
 * Specifying timestamps, deleteFamily and deleteColumns will delete all versions with a timestamp
 * less than or equal to that passed. If no timestamp is specified, an entry is added with a
 * timestamp of 'now' where 'now' is the servers's EnvironmentEdgeManager.currentTime(). Specifying
 * a timestamp to the deleteColumn method will delete versions only with a timestamp equal to that
 * specified. If no timestamp is passed to deleteColumn, internally, it figures the most recent
 * cell's timestamp and adds a delete at that timestamp; i.e. it deletes the most recently added
 * cell.
 * <p>
 * The timestamp passed to the constructor is used ONLY for delete of rows. For anything less -- a
 * deleteColumn, deleteColumns or deleteFamily -- then you need to use the method overrides that
 * take a timestamp. The constructor timestamp is not referenced.
 */
@InterfaceAudience.Public
public class Delete extends Mutation {
  /**
   * Create a Delete operation for the specified row.
   * <p>
   * If no further operations are done, this will delete everything associated with the specified
   * row (all versions of all columns in all families), with timestamp from current point in time to
   * the past. Cells defining timestamp for a future point in time (timestamp > current time) will
   * not be deleted.
   * @param row row key
   */
  public Delete(byte[] row) {
    this(row, HConstants.LATEST_TIMESTAMP);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.
   * <p>
   * If no further operations are done, this will delete all columns in all families of the
   * specified row with a timestamp less than or equal to the specified timestamp.
   * <p>
   * This timestamp is ONLY used for a delete row operation. If specifying families or columns, you
   * must specify each timestamp individually.
   * @param row       row key
   * @param timestamp maximum version timestamp (only for delete row)
   */
  public Delete(byte[] row, long timestamp) {
    this(row, 0, row.length, timestamp);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.
   * <p>
   * If no further operations are done, this will delete all columns in all families of the
   * specified row with a timestamp less than or equal to the specified timestamp.
   * <p>
   * This timestamp is ONLY used for a delete row operation. If specifying families or columns, you
   * must specify each timestamp individually.
   * @param row We make a local copy of this passed in row.
   */
  public Delete(final byte[] row, final int rowOffset, final int rowLength) {
    this(row, rowOffset, rowLength, HConstants.LATEST_TIMESTAMP);
  }

  /**
   * Create a Delete operation for the specified row and timestamp.
   * <p>
   * If no further operations are done, this will delete all columns in all families of the
   * specified row with a timestamp less than or equal to the specified timestamp.
   * <p>
   * This timestamp is ONLY used for a delete row operation. If specifying families or columns, you
   * must specify each timestamp individually.
   */
  public Delete(final byte[] row, final int rowOffset, final int rowLength, long timestamp) {
    checkRow(row, rowOffset, rowLength);
    this.row = Bytes.copy(row, rowOffset, rowLength);
    setTimestamp(timestamp);
  }

  /**
   * Create a Delete operation using another Delete as template.
   * @param deleteToCopy delete to copy
   */
  public Delete(final Delete deleteToCopy) {
    super(deleteToCopy);
  }

  /**
   * Construct the Delete with user defined data. NOTED: 1) all cells in the familyMap must have the
   * delete type. see {@link org.apache.hadoop.hbase.Cell.Type} 2) the row of each cell must be same
   * with passed row.
   * @param row       row. CAN'T be null
   * @param ts        timestamp
   * @param familyMap the map to collect all cells internally. CAN'T be null
   */
  public Delete(byte[] row, long ts, NavigableMap<byte[], List<Cell>> familyMap) {
    super(row, ts, familyMap);
  }

  /**
   * Add an existing delete marker to this Delete object.
   * @param cell An existing cell of type "delete".
   * @return this for invocation chaining
   */
  @Override
  public Delete add(Cell cell) throws IOException {
    super.add(cell);
    return this;
  }

  /**
   * Delete all versions of all columns of the specified family.
   * <p>
   * Overrides previous calls to deleteColumn and deleteColumns for the specified family.
   * @param family family name
   * @return this for invocation chaining
   */
  public Delete addFamily(final byte[] family) {
    this.addFamily(family, this.ts);
    return this;
  }

  /**
   * Delete all columns of the specified family with a timestamp less than or equal to the specified
   * timestamp.
   * <p>
   * Overrides previous calls to deleteColumn and deleteColumns for the specified family.
   * @param family    family name
   * @param timestamp maximum version timestamp
   * @return this for invocation chaining
   */
  public Delete addFamily(final byte[] family, final long timestamp) {
    checkTimestamp(timestamp);
    List<ExtendedCell> list = getCellList(family);
    if (!list.isEmpty()) {
      list.clear();
    }
    KeyValue kv = new KeyValue(row, family, null, timestamp, KeyValue.Type.DeleteFamily);
    list.add(kv);
    return this;
  }

  /**
   * Delete all columns of the specified family with a timestamp equal to the specified timestamp.
   * @param family    family name
   * @param timestamp version timestamp
   * @return this for invocation chaining
   */
  public Delete addFamilyVersion(final byte[] family, final long timestamp) {
    checkTimestamp(ts);
    List<ExtendedCell> list = getCellList(family);
    list.add(new KeyValue(row, family, null, timestamp, KeyValue.Type.DeleteFamilyVersion));
    return this;
  }

  /**
   * Delete all versions of the specified column.
   * @param family    family name
   * @param qualifier column qualifier
   * @return this for invocation chaining
   */
  public Delete addColumns(final byte[] family, final byte[] qualifier) {
    addColumns(family, qualifier, this.ts);
    return this;
  }

  /**
   * Delete all versions of the specified column with a timestamp less than or equal to the
   * specified timestamp.
   * @param family    family name
   * @param qualifier column qualifier
   * @param timestamp maximum version timestamp
   * @return this for invocation chaining
   */
  public Delete addColumns(final byte[] family, final byte[] qualifier, final long timestamp) {
    checkTimestamp(ts);
    List<ExtendedCell> list = getCellList(family);
    list.add(new KeyValue(this.row, family, qualifier, timestamp, KeyValue.Type.DeleteColumn));
    return this;
  }

  /**
   * Delete the latest version of the specified column. This is an expensive call in that on the
   * server-side, it first does a get to find the latest versions timestamp. Then it adds a delete
   * using the fetched cells timestamp.
   * @param family    family name
   * @param qualifier column qualifier
   * @return this for invocation chaining
   */
  public Delete addColumn(final byte[] family, final byte[] qualifier) {
    this.addColumn(family, qualifier, this.ts);
    return this;
  }

  /**
   * Delete the specified version of the specified column.
   * @param family    family name
   * @param qualifier column qualifier
   * @param timestamp version timestamp
   * @return this for invocation chaining
   */
  public Delete addColumn(byte[] family, byte[] qualifier, long timestamp) {
    checkTimestamp(ts);
    List<ExtendedCell> list = getCellList(family);
    KeyValue kv = new KeyValue(this.row, family, qualifier, timestamp, KeyValue.Type.Delete);
    list.add(kv);
    return this;
  }

  @Override
  public Delete setTimestamp(long timestamp) {
    super.setTimestamp(timestamp);
    return this;
  }

  @Override
  public Delete setAttribute(String name, byte[] value) {
    return (Delete) super.setAttribute(name, value);
  }

  @Override
  public Delete setId(String id) {
    return (Delete) super.setId(id);
  }

  @Override
  public Delete setDurability(Durability d) {
    return (Delete) super.setDurability(d);
  }

  @Override
  public Delete setClusterIds(List<UUID> clusterIds) {
    return (Delete) super.setClusterIds(clusterIds);
  }

  @Override
  public Delete setCellVisibility(CellVisibility expression) {
    return (Delete) super.setCellVisibility(expression);
  }

  @Override
  public Delete setACL(String user, Permission perms) {
    return (Delete) super.setACL(user, perms);
  }

  @Override
  public Delete setACL(Map<String, Permission> perms) {
    return (Delete) super.setACL(perms);
  }

  @Override
  public Delete setTTL(long ttl) {
    throw new UnsupportedOperationException("Setting TTLs on Deletes is not supported");
  }

  @Override
  public Delete setPriority(int priority) {
    return (Delete) super.setPriority(priority);
  }

  @Override
  public CellBuilder getCellBuilder(CellBuilderType type) {
    return getCellBuilder(type, Cell.Type.Delete);
  }
}
